Philips TDA8443A Benutzerhandbuch

1995 Mar 07

11

Philips Semiconductors

Product specification

I

2

C-bus controlled YUV/RGB switch

TDA8443A

TIMING CHARACTERISTICS
I

2

C-bus load conditions: 4 k

Ω

 pull-up resistor to +5 V; 200 pF capacitor to GND;

all values are referenced to V

IH

= 3 V and V

IL

= 1.5 V; see Fig.4.

1. Timing t

HD;DAT

 deviates from the I

2

C-bus specification. After reset has been activated, a delay of 50

µ

s must occur

before transmission may be resumed.

t

BUF

time bus must be free before start

4.7

−

µ

s

t

SU;STA

set-up time for start condition

4.7

−

µ

s

t

HD;STA

hold time for start condition

4.0

−

µ

s

t

LOW

SCL and SDA LOW time

4.7

−

µ

s

t

HIGH

SCL HIGH time

4.0

−

µ

s

t

r

SCL and SDA rise time

−

1.0

µ

s

t

f

SCL and SDA fall time

−

0.3

µ

s

t

SU;DAT

data set-up time (write)

250

−

ns

t

HD;DAT

data hold time (write)

note 1

1.0

−

µ

s

t

SU;ACK

acknowledge set-up time

−

2

µ

s

t

HD;ACK

acknowledge hold time

0

−

µ

s

t

SU;STO

set-up time for stop condition

4.7

−

µ

s

Fig.4  I

2

C-bus timing diagram.

handbook, full pagewidth

MLD005

SDA

(WRITE)

SCL

t BUF

t SU; STA

t HD; STA

t LOW

t f

t r

t HD; DAT

t SU; ACK

t HD; ACK

t LOW

t SU; STO

t HIGH

t SU; DAT